Stone-polishing wheel



J. R. MITCHELL.

STONE POLISHING WHEEL.

APPLICATION FILED JULY 9. 1919.

1 54,325 Patented Sept. 28, 1920.

FITSTI 5 F A E UNITED STATES PATENT OFFICE.

JAMES R. MITCHELL, OF MONTPE'LIER, VERMONT, ASSIGNOR TO LANE MANUFAC- TUBING COMPANY, OF MONTPELIER, VERMONT, A. CORPORATION OF VERMONT.

s'roim-ronrsmne WHEEL.

Specification of Letters Patent.-

Patented Sept. 28, 1920.

Application filed July 9, 1919.- Serial No. 309,676.

To all whom it may concern:

Be it known that I, JAMES R. MITCHELL, a citizen of the United States, residing at Montpelier, county of Washington, State of Vermont, have invented certain new and useful Improvements in Stone -Polish1ng Wheels, of which the following is a specification.

This invention relates to stone polishing wheels of the type wherein the abrasive is introduced between spaced flanges which work it against the surface of the stone bein polished as the wheel is rotated.

The object of my invention, generally stated, is to increase the cutting efliciency of Wheels of this class.

One of the factors which seriously complicates the production of a polishing wheel of this type is the difficulty of securing proper feed and, distribution of the abrasive between the feed channels of the wheel. To remedy this and to overcome the tendency of the abrasive to clog between the feed channels, the flanges have been varioiis'ly distributed about the working face of .the wheel and in divers combinations and relations. Usually, however, the flange arrangement hasbeen such as to provide only two abrasive intake openings which impart a single circling motion to the abrasive. I have discovered that I can practically eliminate clo ging by an arrangement and relation of anges which insures a constant selffeed and uniform distribution of the abrasive over all portions of the workingface of the wheel.

According to my invention, the flanges are segmental in form and of different lengths, but all starting at the periphery of the wheel and curving inwardly toward the center thereof. This provides a multiplicity of independent feed channels having their intake openings at spaced points about the periphery of the wheel. and delivering toward the center of the wheel, whereby to impart an individually independent circling and gliding motion to each stream of abrasive fed in betwe'enxcomplementary channel definin flanges, thus reducing to the mini-J mum t e tendency of the abrasive to clog the feed channels and insuring equal distribution to all portions'of the working face of the wheel.

The construction and operation of my polishing wheel is described and illustrated in the following specification and accompanying drawings, throughout which like reference characters are correspondingly employed. In the drawings:

Figure I is a side view of a polishing wheel in accordance with my invention, and.

Fig. II a bottom view thereof.

I have indicated at 1 a plate or disk forming the frame or body of the polishing wheel and at 2 the lugs which receive the driving shaft of the usual polishing machine.

According tomy invention the flanges are segmental in form and, begin at spaced points about the Wheel periphery and curve inwardly toward the center thereof, termlnating at symmetrically varied distances from the periphery. Specifically, the flanges A, B, C and D constitute the longer flange set and are each in the form of a half circle, while flanges E, F, G and H constitute the shorter flange set and are each composed of a quarter circle, and are interposed between the longer flange set. This arrangement gives a plurality of independent abrasive feed channels beginning at the periphery of the disk and extending toward the center, the inner ends of the longer flanges A, B, C- and D extending beyond the terminals of the shorter flanges E, F, G and H, and in effect constituting a substantially complete barrier at the center of the disk to prevent the abrasive from being thrown outwardly toward the periphery by centrifugal force.

. I have applied the letter R to the abrasive receptacle thus formed at the center of the disk by the extended ends or choker-s A B C and D of the longer flanges A, B. (J, and D.

By reason of the multiplicity of peripheral intake openings a constant self-feed of the abrasive is assured at all times, while the individually inde endent feed channels defined by adjacent anges practically eliminate any tendenc of the abrasive to clog between flanges. thus securea constant feed anduniform distribution of the abrasive over all portions of the working face of the wheel.

While I prefer the particular flange arrangement shown and described herein, it will be understood that I reserve the right .to make such modifications in the form, di-

mensions and relation of the flanges as come within the scope andnspirit of my invention,

'set being substantially the extent of a halfcircle and the flanges of the other set being substantially the extent of a quarter circle and being individually interposed between.

the'flanges of the first-named set', all flanges starting at spaced points about the periphery of the disk and curving inwardly toward the center of the disk to provide a multiplicity of independent feed channels each having its intake opening at the perlphery of the disk and the longer flanges constituting a substantially completed barrier about the center of the disk adapted to pre- "vent escape of the abrasive by centrifugal action.

' 2. A polishing wheel comprising a rotatable disk having upon its working face two sets of se mental flanges, the flan es of one set being longer than the flanges o the other set, all flanges starting at spaced points about the periphery of the disk and extending inwardly toward the center of the disk, and the flanges of the lon er set extending beyond the inner end of the flanges of the shorter set and said extensions defining with each othera substantiall completed barrier about the center of the isk adapted to prevent escape of-the abrasive by centrifugal action.

3. A polishing wheelcomprising a rotatable disk having upon its working face a plurality of short and long segmental flanges starting at spaced points about the periphery of the disk and extending inwardly toward the center of the disk, each short flange being arranged between two lofi flanges, the long flanges extending beyon the inner ends of the short flan es and said extensions terminating at su stantially the vertical and horizontal median lines of the disk and defining with each other a substantially completed barrier about the center of the disk adapted to preventescape of the abrasive by centrifugal action. In testimon whereof I aflx my signature in presence 0 two witnesses.

' JAMES R. MITCHELL.

Witnesses:

P. P. PITKIN, J. H. MURPHY. 

